A buffer solution contains 500 mL of 0.2 M CH3COONa and 500 ml of 0.1 M CH3COOH .1 L of water is added to this buffer , pH before and after dilution will be (pka of CH3COOH = 4.74)
3.74
5.04
5.90
7.70
What is binding energy in nucleus , if mass is 0.08181 amu ?
1.2 x 10-4 erg/nucleus
8.2 x 10-4 erg/nucleus
10.2 x 10-4 erg/nucleus
1.9 x 10-4 erg/nucleus
Among third row elements , the IP value :
irregularly changes from left to right across the third row
increases from left to right across the third row
decrease for Na to Ar
remains constant
Hydrofluoric acid shows hydrogen bonding due to :
high electron affinity of fluorine
high bond dissociation energy of fluorine
high electronegativity of fluorine
none of the above
C.
high electronegativity of fluorine
Hydrofluoric acid shows the intermolecular hydrogen bonding due to the small size of fluorine and high electronegativity of fluorine .
Note : Hydrofluoric acid is found in polymeric compound [(HF)n] and liquid state due to then H-bonding .
Metals are good conductor of electricity because they contain :
a network structure
ionic bonds
very few valence electrons
free electrons